<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>V-on指令</title>
  </head>
  <body>
    <!-- v-on:用于绑定事件 -->
    <div id="app">
      <input type="button" v-on:click="doIT" value="V-on指令" />
      <input type="button" @click="doIT" value="@指令" />
      <input type="button" @dblclick="doIT" value="双击按钮" />
      <span @click="eat">{{ nn }}</span>
    </div>
    <!-- 开发环境版本，包含了有帮助的命令行警告 -->
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
      var app = new Vue({
        el: "#app",
        data: {
          nn: "西红柿炒蛋",
        },
        methods: {
          doIT: function () {
            alert("做IT");
          },
          eat: function () {
            this.nn += "好吃的不得了！";
          },
        },
      });
    </script>
  </body>
</html>
